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container_manager.go
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/
container_manager.go
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package main
import (
"fmt"
"math/rand"
"net/http"
"os/exec"
"strings"
"sync"
"time"
)
type RunningService struct {
ContainerID string // docker container ID
AssignedPort int // port assigned to the container
Ready bool // whether the container is ready to serve requests
}
func (rSvc *RunningService) GetHost() string {
return fmt.Sprintf("localhost:%d", rSvc.AssignedPort)
}
type ContainerManager interface {
GetRunningServiceForHost(host string) (*string, error)
}
type DockerContainerManager struct {
mutex *sync.Mutex
containers map[string]*RunningService
usedPorts map[int]bool
sDefManager *ServiceDefinitionManager
}
func NewDockerContainerManager(manager *ServiceDefinitionManager) *DockerContainerManager {
return &DockerContainerManager{
mutex: &sync.Mutex{},
containers: make(map[string]*RunningService),
usedPorts: make(map[int]bool),
sDefManager: manager,
}
}
func (cm *DockerContainerManager) GetRunningServiceForHost(host string) (*string, error) {
name := strings.Split(host, ".")[0]
fmt.Printf("getting container for %s \n", name)
sDef, err := cm.sDefManager.GetServiceDefinitionByName(name)
fmt.Println("got service definition", sDef)
if err != nil {
return nil, err
}
cm.mutex.Lock()
defer cm.mutex.Unlock()
rSvc, exists := cm.containers[sDef.Name]
if !exists {
rSvc, err = cm.startContainer(sDef)
if err != nil {
fmt.Printf("Failed to start container: %s\n", err)
return nil, err
}
}
if !cm.isContainerReady(rSvc) {
return nil, fmt.Errorf("container %s not ready", sDef.Name)
}
svcLocalHost := rSvc.GetHost()
return &svcLocalHost, nil
}
func (cm *DockerContainerManager) startContainer(sDef *ServiceDefinition) (*RunningService, error) {
fmt.Println("Starting container......")
port := cm.getUnusedPort()
fmt.Println("got port......")
rSvc, err := cm.createContainer(sDef, port)
if err != nil {
return nil, err
}
cm.containers[sDef.Name] = rSvc
cm.usedPorts[port] = true
return rSvc, err
}
// create container with docker run
func (cm *DockerContainerManager) createContainer(sDef *ServiceDefinition, assignedPort int) (*RunningService, error) {
image := fmt.Sprintf("%s:%s", sDef.ImageName, sDef.ImageTag)
portMapping := fmt.Sprintf("%d:%d", assignedPort, sDef.Port)
args := []string{"run", "-d"}
args = append(args, "-p", portMapping)
args = append(args, image)
fmt.Println("docker", args)
cmd := exec.Command("docker", args...)
containerID, err := cmd.Output()
if err != nil {
fmt.Printf("Failed to start container: %s\n", err)
return nil, err
}
rSvc := RunningService{
ContainerID: string(containerID),
AssignedPort: assignedPort,
Ready: false,
}
return &rSvc, nil
}
func (cm *DockerContainerManager) getUnusedPort() int {
// get random port between 8000 and 9000
// check if port is in use
for {
port := rand.Intn(1000) + 8000
fmt.Println("checking port", port)
_, exists := cm.usedPorts[port]
if !exists {
return port
}
}
}
func (cm *DockerContainerManager) isContainerReady(rSvc *RunningService) bool {
if rSvc.Ready {
return true
}
start := time.Now()
for i := 0; i < 30; i++ {
fmt.Println("Waiting for container to start...")
resp, err := http.Get(fmt.Sprintf("http://localhost:%d", rSvc.AssignedPort))
if err != nil {
fmt.Println(err.Error())
}
if resp != nil && resp.StatusCode == 200 {
fmt.Println("Container ready!")
fmt.Printf("Container started in %s\n", time.Since(start))
rSvc.Ready = true
return true
}
fmt.Println("Container not ready yet...")
time.Sleep(1 * time.Second)
}
return false
}